import Vue from 'vue'
import VueRouter from 'vue-router'

// 第一个分组
// import Login from '../components/Login.vue'
const Login = () =>
    import ( /* webpackChunkName: "login_home_welcome" */ '../components/Login.vue')
    // import Home from '../components/Home.vue'
const Home = () =>
    import ( /* webpackChunkName: "login_home_welcome" */ '../components/Home.vue')
    // import Welcome from '../components/Welcome.vue'
const Welcome = () =>
    import ( /* webpackChunkName: "login_home_welcome" */ '../components/Welcome.vue')

// 第二个分组
// import Users from '../components/user/Users.vue'
const Users = () =>
    import ( /* webpackChunkName: "Users_Rights_Roles" */ '../components/user/Users.vue')
    // import Rights from '../components/power/Rights.vue'
const Rights = () =>
    import ( /* webpackChunkName: "Users_Rights_Roles" */ '../components/power/Rights.vue')
    // import Roles from '../components/power/Roles.vue'
const Roles = () =>
    import ( /* webpackChunkName: "Users_Rights_Roles" */ '../components/power/Roles.vue')

// 第三个分组
// import Cate from '../components/goods/Cate.vue'
const Cate = () =>
    import ( /* webpackChunkName: "Cate_Params" */ '../components/goods/Cate.vue')
    // import Params from '../components/goods/Params.vue'
const Params = () =>
    import ( /* webpackChunkName: "Cate_Params" */ '../components/goods/Params.vue')

// 第四个分组
// import GoodsList from '../components/goods/GoodsList.vue'
const GoodsList = () =>
    import ( /* webpackChunkName: "GoodsList_Add" */ '../components/goods/GoodsList.vue')
    // import Add from '../components/goods/Add.vue'
const Add = () =>
    import ( /* webpackChunkName: "GoodsList_Add" */ '../components/goods/Add.vue')

// 第五个分组
// import Order from '../components/order/Order.vue'
const Order = () =>
    import ( /* webpackChunkName: "Order_Report" */ '../components/order/Order.vue')
    // import Report from '../components/report/Report.vue'
const Report = () =>
    import ( /* webpackChunkName: "Order_Report" */ '../components/report/Report.vue')

Vue.use(VueRouter)

const router = new VueRouter({
    routes: [{
            path: '/',
            redirect: '/login'
        },
        {
            path: '/login',
            component: Login
        },
        {
            path: '/home',
            component: Home,
            redirect: '/welcome',
            children: [{
                    path: '/welcome',
                    component: Welcome
                },
                {
                    path: '/users',
                    component: Users
                },
                {
                    path: '/rights',
                    component: Rights
                },
                {
                    path: '/roles',
                    component: Roles
                },
                {
                    path: '/categories',
                    component: Cate
                },
                {
                    path: '/params',
                    component: Params
                },
                {
                    path: '/goods',
                    component: GoodsList
                },
                {
                    path: '/goods/add',
                    component: Add
                },
                {
                    path: '/orders',
                    component: Order
                },
                {
                    path: '/reports',
                    component: Report
                }
            ]
        }
    ]
})

// 挂载路由导航守卫
router.beforeEach((to, from, next) => {
    // to 是将要访问的路径
    // from 代表从哪个路径跳转而来
    // next 是一个函数，表示放行
    //  next() 放行   next('/login')  强制跳转

    // 判断用户访问的是不是登录页  访问登录页直接放行
    if (to.path === '/login') return next()
        // 获取token
    const tokenStr = window.sessionStorage.getItem('token')
        // tokenStr不存在则强制跳转到login
    if (!tokenStr) return next('/login')
        // tokenStr存在则放行
    next()
})

// export default 只能导出一个默认模块，这个模块可以匿名
// 引入的时候可以给这个模块取任意名字，例如 "obj"，且不需要用大括号括起来。
// 暴露路由对象
export default router

// 解决路由重复报错问题
const originalPush = VueRouter.prototype.push
VueRouter.prototype.push = function push(location) {
    return originalPush.call(this, location).catch(err => err)
}